Check the following points:

• Check the printer's environment. Conditions such as high humidity and high temperatures may cause this print quality problem.
  
  
• Make sure that you use paper that meets our specifications.
  To see what kind of paper you can use, click here.
  
  
• Identify the color causing the problem and put in a new toner cartridge.
  To see how to replace the toner cartridge, click here.
  
  
• If the problem continues, put in a new drum unit.
  To see how to replace the drum unit, click here.